Motor-driven surface-treating machine



June 12,1923.

A. A. CLARKE MOTOR DRIVEN SURFACE TREATING MACHINE' 1920 ZSheets-Sheet 1' Original Filed Feb 13,

June 12,1923. 1,458,874

A. A. CLARKE MOTOR DRIVEN SURFACE TREATING MACHINE Original Filed Feb. 13, 1920 2 sheets-sheet 2 nun 51"],

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//v VEA/TUR flfl 6' a 2746.

WZ/Ww Patented June 12, 1923.

- UNITED ALEX [A.,; prime, ,oFfnALn s, TEXAS. I

- now'bmmwm sw amc mmm MAorrrnn Original application filed February 13,1920, se'rmi no. 358,485; Divided'and Januar aa 1921.-

To all whom it may mm:

Be itknownthat L-ALEX Grammacitizen of the United States; residing at Dallasfin the county-10f Dallas and State of '.I exas,-l1ave invented certain new and:

useful Improvements in Motor-Driven 'Sur 'face Treatin -Machines; of which the-fol,-

b lowing 1s a specification. a

This invention relates tone-W and usef-ul improvements in motor driven surface treating machines. V This application is a division-of my ap-. plication filed February 13, 1920, Serial No. 358,485.

The invention has to do with the economic and practical arrangement of the various 1;. artg whereby simplicity and efliciency 18 had.

Theobjec-t of the invention'is to provide '20 ahousing 'structure conducive to quantity production-and'in' carrying out the-invention various novel'feature's are evolved, to-*- gether with certain 'mechanical expedientswhichmake for a=finished'product.- A construction'designed to carry out the invention will be hereinafter described to-v 5:1 ge-ther With other features of the invention.

= The invention' will be more readily understood from a reading of the following specification and 'by reference to .the=acco1npany'-' ing' drawings, in'whichan example of the: invention is shown; and wherein I "Fig: 1 is 'a side} elevation of a ma'ch-in constructed in accordancewith" this invene 5 ti n g V; ;.V M1 1 TY-I i Fig. 2 is a plan ViGWyOf the same,'-".I 'Figi'B-is 'aF-fce'ntral vertical sectional view of the machine, T

Fig. 4 is a partial longitudinal vertical sectional view,

Fig. 5 is a sectional detail of one of vertical adjusting posts and component parts,

Fig. 6 is a sectional detail of the drum and sleeve fastening means, and

Fig. 7 is adetail of the adjustment looking means.

In the drawings the numeral 10 designates an upright rectangular frame having out,-

wardly directed brackets 11 at its top and bottom at each side. At the center of the bottom of each end of the frame a collar 12 is-fastened and receives the ends of fixed shaft 13 on Which a ball bearing cone let is 56 mounted to receive near each end, ball bear-.

the

Serial 'N0:-439,195.

this application and races-16am secured to-the inside of end:v

Fig." 6 tlie sand. paper 19 Ihasits ends fasthe drum by'means of a bar'21 and screws 22,;Wh1ch bar In practice has" its outer surv-f face inwardfrom the surface of'th'e sleeve formed by the sand paper so. as not to en gage the surface Worked upon.

W thin the upper. portion of the a motor chamber 23 is formed and this:

tened. in a depression 20. in the :surface of frame i chambernpr'eferably circular in cross seca tion with lts top Wall 2 1 projecting upward.

from the frame. The fields 25 'of a motor are mounted in vthis'chamloer Which extends transversely of the 'frame'the same as the drum. At one end of the chamber a mounting plate 26 is'inserted. and properly fas-- tened. This plate haslapertures 27. An armature 28 is r mounted within. the field; 25 and hasf'a shaft 29-Which engages in ball site end inaball bearing memaber 31 which is carried by ainounting'plate 32qha-ving' aperturesi33., A fanB l-ismounted 'ori-th'en armature 28- .and. is I revolved thereby. This fan sets circulationof air thru the apertures 27 and .38 thereby cooling the motor Which is a veryimporta-nt and essentialfeature;

A spur gear'35wismou1ited 'onfth e arm'a- V ture shaft and meshes withja pinion .36' I mounted .o'n' a bracket aha projectingthru the bottom Wallfo-f the. chamber 23;

This pinion 36 .mesh'es with and drives a gear 38 fastened to the drum 18; It will be seen that the drum is driven bymeans of a whole arrangement is compact and simple. The frame 15 mounted upon vertlcal posts '38 with-theirlower ends fastenedto a base 39. a As shown in detail in Fig. 5 the upper f portionof each post is screvv-threaded and receives a sprocket 40 which is threaded thereon. Each' sprocket 10' bears on the i top of the frame and is confinedby an arm,

41 extending from the top Wall 2 1. An endless sprocket chain 42 passes over all of the lib 4 so bearing 30 insthe platfeQG and atzits oppon sprocket wheels a0 and is tightened by means of a belt tighteiier 43 mounted on. one of the brackets 11 on top of the frame. Between the brackets at one side of the frame a tu bular handle 44 is mounted while in the other two brackets a tubular handle is mounted. The lower end of thehandle 44 is confined within a flange meniberf lti secured to the lower bracket 11; while. the upper end is confined in a similar flange member 47 so that the handle may be rotated. A plug 48 as is best shown in Fig. 4 is secured in the upper end of the tubular handle and projects upward thru the top bracket 11 and has fixed thereon a sprocket wheel 49 over which the chain a2 also passes. It will be seen that by rotating the handle o'the chain 42 is moved in either direction and the sprocket wheel i0 simultaneously rotated; whereby the frame 10 is adjusted vertically on the posts. For locking theparts in adjusted po sition an idle sprocket 5O isloosely mounted on a post 51 so as to mesh with the sprocket 4-9. A thumb nut 5L is threaded on the post and when tightened fastens the sprocket against rotation thus also looking the sprocket 49 against rotation.

\Vitliin the handle as which is not rotatable, a suitable electric switch 53 is mounted and provided with a plunger 5a projecting thin the wall of the handle. An electric cable 55 leads into and thru the handle to the switch 53 while a second cable 56 leads from the switch to the motor and is suitably connected thereto,.the details ofconstruction of the motor not being illustrated or described. It will be seen that the operator may turn the handle as: with one hand and adjust the machine and may operate the switch with the other hand, so that the machine is at all times entirely under his control.

The vase 39 constitutes an elongated plate member having an opening 57 at its central portion thru which the drum projects to engage th work. ,The base also has shoes or runners58 of cloth or any suitable material stretched over its bottom surface on each travel thereby turning the sprockets. 40.

which ride up or down on the posts 38 according to the direction in which the handle at is rotated. The frame being, attached orv supported on the sprockets 40 is adjusted vertically whereby the drum 18 is movedtoward; ortrom the work thru the slot 57 in the base; It will be seen that a very-minute ad 39. justment may be had and the drum mayv be adjusted while the machine is in operation.

The sand paper 19 may be easily replacedwhen necessary.

What I claim, is:

In a machine of the character described, a.

frame having a horizontal traiisversechamber tormed integral within the-upper end thereof, said chamber having its wall formedimpertorate and prov ded in its lower por.

tion with an'opening, a. horizontal bracket secured to the lower portion ofsaid wall and extending into .said opening, plates detach-, ably held within the ends of the chamber, bearing devices carried by said plates, a motor mounted in the chamber and embodying an armature shaft journaled in said bearing devices, a; rotating surface treating element rotatably. mounted within the lower;

portion of said frame,a gear mounted upon the surface treating element and arranged within said trame, an intermediate gear' arranged within said opening within the trame and mounted upon said horizontal.

bracket, a gear mounted upon the armature shaft and arranged within said chamber and engaging the intermediate gear, and,

supporting means for the frame.

In testimony whereof I affix my signature.

ALEX A. CLARKE. 

